Citizen Series 8 870vsSeiko Prospex Land Mechanical GMT
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Measurements
Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

Series 8 870

Prospex Land Mechanical GMT
Diameter
39mm
39.5mm
Lug-to-Lug
n/a
46.4mm
Thickness
n/a
13.6mm
Water Resistance
100m
200m
highest
Power Reserve
42h
72h
highest
MSRP
$1,095
lowest
$1,150
Movement
Miyota 9051
Seiko 6R54
Case
6 specsCrystal & Dial
4 specsMovement
3 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
The Citizen Series 8 870 is praised for its modern Japanese design and compelling value. Reviewers note its glossy dial with applied markers and a flat sapphire crystal that can collect fingerprints. The watch utilizes the Miyota 9051 automatic movement and offers 100m water resistance within a 39mm steel case. On balance, owners and reviewers rate the Citizen Series 8 870 well for its sporty dress watch aesthetic and perceived value.
Owners widely praise the Seiko Prospex Land Mechanical GMT for its faithful reconstruction of the 6117 design, its attractive gray dial, and comfortable bracelet. Reviewers highlight its handsome everyday sports watch appeal and classic Seiko diver aesthetics. However, community members are split on the value proposition, with many deeming it overpriced at $970, suggesting a better price point around $700 or on sale. Some owners criticize the 6R54 movement's accuracy, reporting deviations of up to +/- 20 seconds per day, and prefer a local jumping GMT function over the caller style. On balance, owners and reviewers appreciate the Seiko Prospex Land Mechanical GMT's design and wearability, but opinions are divided on its price and movement performance relative to alternatives.
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